Zouroku and Ichijo take Sana on a field trip to show her more of the outside world. However, while walking through the city, Sana encounters Asahi and Yonaga by chance. The twins use their powers to flee and Sana uses hers to give chase. However, Sana's powers suffer an "error" that randomly manifests a massive rock that threatens to crush her and Asahi and Yonaga...